Mechano-Chemical Synthesis, Structural Features and Optical Gap of Hybrid CH3NH3CdBr3 Perovskite

• Published in: Materials Vol. 14; no. 20; p. 6039
• Main Authors: Alonso, José Antonio, Kayser, Paula, Hong, Bo-Kyung, Álvarez-Galván, María Consuelo, Fauth, Francois, Alberto López, Carlos
• Format: Journal Article
• Language: English
• Published: Basel MDPI AG 13.10.2021; MDPI
• Subjects: acentric crystal structure; Angular resolution; Ball milling; Chemical synthesis; Crystal structure; Crystallization; Laboratories; Lead compounds; Metal halides; methylammonium cadmium tribromide; Optoelectronics; Perovskites; Phase transitions; Photovoltaic cells; polar CH3NH3+ orientation; Radiation; Scanning electron microscopy; Solar cells; Synchrotron radiation; Synchrotrons; Ultraviolet detectors; ultraviolet pigment and solar cells; Germany
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma14206039

Hybrid methyl-ammonium (MA:CH3NH3+) lead halide MAPbX3 (X = halogen) perovskites exhibit an attractive optoelectronic performance that can be applied to the next generation of solar cells. To extend the field of interest of these hybrid materials, we describe the synthesis by a solvent-free ball-milling procedure, yielding a well crystallized, pure and moisture stable specimen of the Cd tribromide counterpart, MACdBr3, which contains chains of face-sharing CdBr6 octahedra in a framework defined in the Cmc21 (No 36) space group. The details of the structural arrangement at 295 K have been investigated by high angular resolution synchrotron x-ray diffraction (SXRD), including the orientation of the organic MA units, which are roughly aligned along the c direction, given the acentric nature of the space group. UV-vis spectra unveil a gap of 4.6 eV, which could be useful for ultraviolet detectors.